I suppose but that is an easy way out. Even after 16 years Danielle seemed to remember lots of details, of her crew, of the Others etc. I think the first person she met when she crashed on the island would stick in her mind. Or at least ring a bell if she saw him again after the 815 crash.

Although the only other thing I can think of is that Faraday's idea of time travel is wrong and the Losties are changing the past.

Trauma can do crazy things to a person's mind and like Randy and Rico pointed out, we don't have any idea how lmuch time they spend together

I was thinking more of when Daniel knocked on the hatch and talked to Desmond. Desmond didn't remember until right after we saw them speak. So, I think if Danielle was still alive, she may "now" have remembered meeting Jin in the past.

Sometimes people just forget... This meeting could last 15 minutes for as much as we know right now..

Wait a minute....
You're pregnant, adrift in a raft during a storm, see a body floating on a piece of wood and pull him into the raft with you, drag him onto the beach and tend to him. Then, 16 years later you see him on again on the same island but he hasn't aged, and you don't remember him??????
If anything, THAT would be enough to make her crazy!!!

This is a good question. However, I think it is answered by the scene where Daniel speaks to Desmond at the hatch.

When Daniel spoke to desmond it took place in the past, yet Desmond didn't recognize Daniel when they met. Desmond didn't even remember the incident until the moment it took place in off island time. As I recall I believe that it woke Desmond up from his sleep the moment that Daniel told Island Desmond in the past to save them.

So there appears to be a temporal issue with history alteration. When Danielle Russo saw Jin shortly after the crash of Oceanic at that time Jin had not jumped back in time.

This is a confusing explaination I know, but consider that When Russo met Jin on the Island (season 1 or 2) he had not jumped back in time yet to see Russo when they crashed their boat. THerefore at the time they first met in season 1 or 2, the memory of Russo meeting Jin had not been created. Just as Desmond didn't know Daniel because the Memory of meeting him outside the hatch had not been created. The moment Daniel spoke to Hatchmonkey Desmond, was the moment the memory was created. Russo will never recall that incident of seeing Jin, because she is now dead.

Wait a minute....
You're pregnant, adrift in a raft during a storm, see a body floating on a piece of wood and pull him into the raft with you, drag him onto the beach and tend to him. Then, 16 years later you see him on again on the same island but he hasn't aged, and you don't remember him??????
If anything, THAT would be enough to make her crazy!!!

Maybe it did, maybe she couldn't beliee her own eyes and kept her mouth shut, it's not like Danielle seemed big on sharing anyway

In Exodus she came to the beach and addressed the Losties about the pillar of smoke; beyond that I don't remember her interacting with him.
And he was at the beach during Though the Looking Glass.
Maybe when the two teams met up at the fuselage in The Beginning of the End.
But nothing direct.